//===--- swift-refactor.cpp - Test driver for local refactoring --*- C++ -*-==//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

#include "swift/Basic/Defer.h"
#include "swift/Basic/LLVMInitialize.h"
#include "swift/Frontend/Frontend.h"
#include "swift/Frontend/PrintingDiagnosticConsumer.h"
#include "swift/IDE/Refactoring.h"
#include "swift/IDE/Utils.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"

#include <regex>

using namespace swift;
using namespace swift::ide;

namespace options {
static llvm::cl::opt<RefactoringKind>
Action(llvm::cl::desc("kind:"), llvm::cl::init(RefactoringKind::None),
       llvm::cl::values(
           clEnumValN(RefactoringKind::LocalRename,
                      "rename", "Perform rename refactoring"),
           clEnumValN(RefactoringKind::ExtractExpr,
                      "extract-expr", "Perform extract expression refactoring"),
           clEnumValN(RefactoringKind::ExtractRepeatedExpr,
                      "extract-repeat", "Perform extract repeated expression refactoring"),
           clEnumValN(RefactoringKind::FillProtocolStub,
                      "fill-stub", "Perform fill protocol stub refactoring"),
           clEnumValN(RefactoringKind::ExpandDefault,
                      "expand-default", "Perform expand default statement refactoring"),
           clEnumValN(RefactoringKind::ExpandSwitchCases,
                      "expand-switch-cases", "Perform switch cases expand refactoring"),
           clEnumValN(RefactoringKind::LocalizeString,
                      "localize-string", "Perform string localization refactoring"),
           clEnumValN(RefactoringKind::CollapseNestedIfStmt,
                      "collapse-nested-if", "Perform collapse nested if statements"),
           clEnumValN(RefactoringKind::ConvertToDoCatch,
                      "convert-to-do-catch", "Perform force try to do try catch refactoring"),
           clEnumValN(RefactoringKind::SimplifyNumberLiteral,
                      "simplify-long-number", "Perform simplify long number literal refactoring"),
           clEnumValN(RefactoringKind::ConvertStringsConcatenationToInterpolation,
                      "strings-concatenation-to-interpolation", "Perform strings concatenation to interpolation refactoring"),
           clEnumValN(RefactoringKind::ExpandTernaryExpr,
                      "expand-ternary-expr", "Perform expand ternary expression"),
           clEnumValN(RefactoringKind::ConvertToTernaryExpr,
                      "convert-to-ternary-expr", "Perform convert to ternary expression"),
		       clEnumValN(RefactoringKind::ConvertIfLetExprToGuardExpr,
                      "convert-to-guard", "Perform convert to guard expression"),
           clEnumValN(RefactoringKind::ConvertGuardExprToIfLetExpr,
                      "convert-to-iflet", "Perform convert to iflet expression"),
           clEnumValN(RefactoringKind::ExtractFunction,
                      "extract-function", "Perform extract function refactoring"),
           clEnumValN(RefactoringKind::MoveMembersToExtension,
                      "move-to-extension", "Move selected members to an extension"),
           clEnumValN(RefactoringKind::GlobalRename,
                      "syntactic-rename", "Perform syntactic rename"),
           clEnumValN(RefactoringKind::FindGlobalRenameRanges,
                      "find-rename-ranges", "Find detailed ranges for syntactic rename"),
           clEnumValN(RefactoringKind::FindLocalRenameRanges,
                      "find-local-rename-ranges", "Find detailed ranges for local rename"),
           clEnumValN(RefactoringKind::TrailingClosure,
                      "trailingclosure", "Perform trailing closure refactoring"),
           clEnumValN(RefactoringKind::ReplaceBodiesWithFatalError,
                      "replace-bodies-with-fatalError", "Perform trailing closure refactoring"),
           clEnumValN(RefactoringKind::MemberwiseInitLocalRefactoring, "memberwise-init", "Generate member wise initializer"),
           clEnumValN(RefactoringKind::AddEquatableConformance, "add-equatable-conformance", "Add Equatable conformance"),
           clEnumValN(RefactoringKind::ConvertToComputedProperty,
                      "convert-to-computed-property", "Convert from field initialization to computed property"),
           clEnumValN(RefactoringKind::ConvertToSwitchStmt, "convert-to-switch-stmt", "Perform convert to switch statement"),
           clEnumValN(RefactoringKind::ConvertCallToAsyncAlternative,
                      "convert-call-to-async-alternative", "Convert call to use its async alternative (if any)"),
           clEnumValN(RefactoringKind::ConvertToAsync,
                      "convert-to-async", "Convert the entire function to async"),
           clEnumValN(RefactoringKind::AddAsyncAlternative,
                      "add-async-alternative", "Add an async alternative of a function taking a callback"),
           clEnumValN(RefactoringKind::AddAsyncWrapper,
                      "add-async-wrapper", "Add an async alternative that forwards onto the function taking a callback")));


static llvm::cl::opt<std::string>
ModuleName("module-name", llvm::cl::desc("The module name of the given test."),
            llvm::cl::init("swift_refactor"));

static llvm::cl::opt<std::string>
SourceFilename("source-filename", llvm::cl::desc("Name of the source file"));

static llvm::cl::list<std::string>
InputFilenames(llvm::cl::Positional, llvm::cl::desc("[input files...]"),
               llvm::cl::ZeroOrMore);

static llvm::cl::opt<std::string>
    RewrittenOutputFile("rewritten-output-file",
                        llvm::cl::desc("Name of the rewritten output file"));

static llvm::cl::opt<std::string>
LineColumnPair("pos", llvm::cl::desc("Line:Column pair or /*label*/"));

static llvm::cl::opt<std::string>
EndLineColumnPair("end-pos", llvm::cl::desc("Line:Column pair or /*label*/"));

static llvm::cl::opt<std::string>
NewName("new-name", llvm::cl::desc("A given name to rename to"),
        llvm::cl::init("new_name"));

static llvm::cl::opt<std::string>
OldName("old-name", llvm::cl::desc("The expected existing name"),
        llvm::cl::init("old_name"));

static llvm::cl::opt<bool>
IsFunctionLike("is-function-like", llvm::cl::desc("The symbol being renamed is function-like"),
               llvm::cl::ValueDisallowed);

static llvm::cl::opt<bool>
IsNonProtocolType("is-non-protocol-type",
                  llvm::cl::desc("The symbol being renamed is a type and not a protocol"));

static llvm::cl::opt<bool> EnableExperimentalConcurrency(
    "enable-experimental-concurrency",
    llvm::cl::desc("Whether to enable experimental concurrency or not"));

static llvm::cl::opt<bool> EnableExperimentalStringProcessing(
    "enable-experimental-string-processing",
    llvm::cl::desc("Whether to enable experimental string processing or not"));

static llvm::cl::opt<std::string>
    SDK("sdk", llvm::cl::desc("Path to the SDK to build against"));

static llvm::cl::list<std::string>
    ImportPaths("I",
                llvm::cl::desc("Add a directory to the import search path"));

static llvm::cl::opt<std::string>
Triple("target", llvm::cl::desc("target triple"));

static llvm::cl::opt<std::string> ResourceDir(
    "resource-dir",
    llvm::cl::desc("The directory that holds the compiler resource files"));

enum class DumpType {
  REWRITTEN,
  JSON,
  TEXT
};
static llvm::cl::opt<DumpType> DumpIn(
    llvm::cl::desc("Dump edits to stdout as:"),
    llvm::cl::init(DumpType::REWRITTEN),
    llvm::cl::values(
        clEnumValN(DumpType::REWRITTEN, "dump-rewritten",
                   "rewritten file"),
        clEnumValN(DumpType::JSON, "dump-json",
                   "JSON"),
        clEnumValN(DumpType::TEXT, "dump-text",
                   "text")));

static llvm::cl::opt<bool>
AvailableActions("actions",
            llvm::cl::desc("Dump the available refactoring kind for a given range"),
            llvm::cl::init(false));
}

bool doesFileExist(StringRef Path) {
  llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> FileBufOrErr =
    llvm::MemoryBuffer::getFile(Path);
  if(FileBufOrErr)
    return true;
  return false;
}

struct RefactorLoc {
  unsigned Line;
  unsigned Column;
  NameUsage Usage;
};

NameUsage convertToNameUsage(StringRef RoleString) {
  if (RoleString == "unknown")
    return NameUsage::Unknown;
  if (RoleString == "def")
    return NameUsage::Definition;
  if (RoleString == "ref")
    return NameUsage::Reference;
  if (RoleString == "call")
    return NameUsage::Call;
  llvm_unreachable("unhandled role string");
}

std::vector<RefactorLoc> getLocsByLabelOrPosition(StringRef LabelOrLineCol,
                                                         std::string &Buffer) {

  std::vector<RefactorLoc> LocResults;
  if (LabelOrLineCol.empty())
    return LocResults;

  if (LabelOrLineCol.contains(':')) {
    auto LineCol = parseLineCol(LabelOrLineCol);
    if (LineCol.hasValue()) {
      LocResults.push_back({LineCol.getValue().first,LineCol.getValue().second,
        NameUsage::Unknown});
    } else {
      llvm::errs() << "cannot parse position pair.";
    }
    return LocResults;
  }

  std::smatch Matches;
  // Intended to match comments like below where the "+offset" and ":usage"
  // are defaulted to 0 and ref respectively
  // /*name+offset:usage*/
  const std::regex LabelRegex("/\\*([^ *:+]+)(?:\\+(\\d+))?(?:\\:([^ *]+))?\\*/|\\n");

  std::string::const_iterator SearchStart(Buffer.cbegin());
  unsigned Line = 1;
  unsigned Column = 1;
  while (std::regex_search(SearchStart, Buffer.cend(), Matches, LabelRegex)) {
    auto EndOffset = Matches.position(0) + Matches.length(0);
    SWIFT_DEFER { SearchStart += EndOffset; };
    if (!Matches[1].matched) {
      ++Line;
      Column = 1;
      continue;
    }
    Column += EndOffset;
    if (LabelOrLineCol == Matches[1].str()) {
      unsigned ColumnOffset = 0;
      if (Matches[2].length() > 0 && !llvm::to_integer(Matches[2].str(), ColumnOffset))
        continue; // bad column offset
      auto Usage = NameUsage::Reference;
      if (Matches[3].length() > 0)
        Usage = convertToNameUsage(Matches[3].str());
      LocResults.push_back({Line, Column + ColumnOffset, Usage});
    }
  }
  return LocResults;
}

std::vector<RenameLoc> getRenameLocs(unsigned BufferID, SourceManager &SM,
                                     ArrayRef<RefactorLoc> Locs,
                                     StringRef OldName, StringRef NewName,
                                     bool IsFunctionLike,
                                     bool IsNonProtocolType) {
  std::vector<RenameLoc> Renames;
  llvm::transform(Locs, std::back_inserter(Renames),
                  [&](const RefactorLoc &Loc) -> RenameLoc {
                    return {Loc.Line, Loc.Column,     Loc.Usage,        OldName,
                            NewName,  IsFunctionLike, IsNonProtocolType};
                  });
  return Renames;
}

RangeConfig getRange(unsigned BufferID, SourceManager &SM,
                                   RefactorLoc Start,
                                   RefactorLoc End) {
    RangeConfig Range;
    SourceLoc EndLoc = SM.getLocForLineCol(BufferID, End.Line,
                                           End.Column);
    Range.BufferId = BufferID;
    Range.Line = Start.Line;
    Range.Column = Start.Column;
    Range.Length = SM.getByteDistance(Range.getStart(SM), EndLoc);

    assert(Range.getEnd(SM) == EndLoc);
    return Range;
}

// This function isn't referenced outside its translation unit, but it
// can't use the "static" keyword because its address is used for
// getMainExecutable (since some platforms don't support taking the
// address of main, and some platforms can't implement getMainExecutable
// without being given the address of a function in the main executable).
void anchorForGetMainExecutable() {}

int main(int argc, char *argv[]) {
  PROGRAM_START(argc, argv);
  INITIALIZE_LLVM();
  llvm::cl::ParseCommandLineOptions(argc, argv, "Swift refactor\n");
  if (options::SourceFilename.empty()) {
    llvm::errs() << "cannot find source filename\n";
    return 1;
  }
  if (!doesFileExist(options::SourceFilename)) {
    llvm::errs() << "cannot open source file.\n";
    return 1;
  }

  CompilerInvocation Invocation;
  Invocation.setMainExecutablePath(
    llvm::sys::fs::getMainExecutable(argv[0],
    reinterpret_cast<void *>(&anchorForGetMainExecutable)));

  Invocation.setSDKPath(options::SDK);
  Invocation.setImportSearchPaths(options::ImportPaths);
  if (!options::Triple.empty())
    Invocation.setTargetTriple(options::Triple);

  if (!options::ResourceDir.empty())
    Invocation.setRuntimeResourcePath(options::ResourceDir);

  Invocation.getFrontendOptions().InputsAndOutputs.addInputFile(
      options::SourceFilename);
  Invocation.getFrontendOptions().RequestedAction = FrontendOptions::ActionType::Typecheck;
  Invocation.getLangOptions().AttachCommentsToDecls = true;
  Invocation.getLangOptions().CollectParsedToken = true;
  Invocation.getLangOptions().BuildSyntaxTree = true;
  Invocation.getLangOptions().DisableAvailabilityChecking = true;

  if (options::EnableExperimentalConcurrency)
    Invocation.getLangOptions().EnableExperimentalConcurrency = true;

  if (options::EnableExperimentalStringProcessing)
    Invocation.getLangOptions().EnableExperimentalStringProcessing = true;

  for (auto FileName : options::InputFilenames)
    Invocation.getFrontendOptions().InputsAndOutputs.addInputFile(FileName);
  Invocation.setModuleName(options::ModuleName);
  CompilerInstance CI;
  // Display diagnostics to stderr.
  PrintingDiagnosticConsumer PrintDiags;
  CI.addDiagnosticConsumer(&PrintDiags);
  std::string InstanceSetupError;
  if (CI.setup(Invocation, InstanceSetupError)) {
    llvm::errs() << InstanceSetupError << '\n';
    return 1;
  }
  registerIDERequestFunctions(CI.getASTContext().evaluator);
  switch (options::Action) {
    case RefactoringKind::GlobalRename:
    case RefactoringKind::FindGlobalRenameRanges:
      // No type-checking required.
      break;
    default:
      CI.performSema();
  }

  SourceFile *SF = nullptr;
  for (auto Unit : CI.getMainModule()->getFiles()) {
    if (auto Current = dyn_cast<SourceFile>(Unit)) {
      if (Current->getFilename() == options::SourceFilename)
        SF = Current;
    }
    if (SF)
      break;
  }
  assert(SF && "no source file?");

  SourceManager &SM = SF->getASTContext().SourceMgr;
  unsigned BufferID = SF->getBufferID().getValue();
  std::string Buffer = SM.getRangeForBuffer(BufferID).str().str();

  auto Start = getLocsByLabelOrPosition(options::LineColumnPair, Buffer);
  if (Start.empty()) {
    llvm::errs() << "cannot parse position pair.\n";
    return 1;
  }

  RefactorLoc EndLoc = Start.front();
  if (options::EndLineColumnPair.getNumOccurrences() == 1) {
    auto End = getLocsByLabelOrPosition(options::EndLineColumnPair, Buffer);
    if (End.size() > 1) {
      llvm::errs() << "only a single start and end position may be specified.";
      return 1;
    }
    EndLoc = End.front();
  }

  RefactorLoc &StartLoc = Start.front();


  if (options::Action == RefactoringKind::FindLocalRenameRanges) {
    RangeConfig Range = getRange(BufferID, SM, StartLoc, EndLoc);
    FindRenameRangesAnnotatingConsumer Consumer(SM, BufferID, llvm::outs());
    return findLocalRenameRanges(SF, Range, Consumer, PrintDiags);
  }

  if (options::Action == RefactoringKind::GlobalRename ||
      options::Action == RefactoringKind::FindGlobalRenameRanges) {
    if (!options::OldName.getNumOccurrences()) {
      llvm::errs() << "old-name must be specified.";
      return 1;
    }
    if (options::Action == RefactoringKind::GlobalRename && !options::NewName.getNumOccurrences()) {
      llvm::errs() << "new-name must be specified.";
      return 1;
    }

    std::string NewName = options::NewName;
    if (!options::NewName.getNumOccurrences()) {
      // Unlike other operations, we don't want to provide a default new_name,
      // since we don't want to validate the new name.
      NewName = "";
    }

    std::vector<RenameLoc>
    RenameLocs = getRenameLocs(BufferID, SM, Start, options::OldName, NewName,
                               options::IsFunctionLike.getNumOccurrences(),
                               options::IsNonProtocolType.getNumOccurrences());

    switch (options::Action) {
    case RefactoringKind::GlobalRename: {
      SourceEditOutputConsumer EditConsumer(SM, BufferID, llvm::outs());
      return syntacticRename(SF, RenameLocs, EditConsumer, PrintDiags);
    }
    case RefactoringKind::FindGlobalRenameRanges: {
      FindRenameRangesAnnotatingConsumer Consumer(SM, BufferID, llvm::outs());
      return findSyntacticRenameRanges(SF, RenameLocs, Consumer, PrintDiags);
    }
    default:
      llvm_unreachable("unexpected refactoring kind");
    }
  }

  RangeConfig Range = getRange(BufferID, SM, StartLoc, EndLoc);

  if (options::Action == RefactoringKind::None) {
    llvm::SmallVector<RefactoringKind, 32> Kinds;
    bool CollectRangeStartRefactorings = false;
    collectAvailableRefactorings(SF, Range, CollectRangeStartRefactorings,
                                 Kinds, {&PrintDiags});
    llvm::outs() << "Action begins\n";
    for (auto Kind : Kinds) {
      llvm::outs() << getDescriptiveRefactoringKindName(Kind) << "\n";
    }
    llvm::outs() << "Action ends\n";
    return 0;
  }

  RefactoringOptions RefactoringConfig(options::Action);
  RefactoringConfig.Range = Range;
  RefactoringConfig.PreferredName = options::NewName;
  std::string Error;

  StringRef RewrittenOutputFile = options::RewrittenOutputFile;
  if (RewrittenOutputFile.empty())
    RewrittenOutputFile = "-";
  std::error_code EC;
  llvm::raw_fd_ostream RewriteStream(RewrittenOutputFile, EC);
  if (RewriteStream.has_error()) {
    llvm::errs() << "Could not open rewritten output file";
    return 1;
  }

  SmallVector<std::unique_ptr<SourceEditConsumer>, 32> Consumers;
  if (!options::RewrittenOutputFile.empty() ||
      options::DumpIn == options::DumpType::REWRITTEN) {
    Consumers.emplace_back(new SourceEditOutputConsumer(
        SF->getASTContext().SourceMgr, BufferID, RewriteStream));
  }
  switch (options::DumpIn) {
  case options::DumpType::REWRITTEN:
    // Already added
    break;
  case options::DumpType::JSON:
    Consumers.emplace_back(new SourceEditJsonConsumer(llvm::outs()));
    break;
  case options::DumpType::TEXT:
    Consumers.emplace_back(new SourceEditTextConsumer(llvm::outs()));
    break;
  }

  BroadcastingSourceEditConsumer BroadcastConsumer(Consumers);
  return refactorSwiftModule(CI.getMainModule(), RefactoringConfig,
                             BroadcastConsumer, PrintDiags);
}